It's because people don't pull the "spare" mobs they run in and pull the first mob they see which isn't 20 mobs deep.
That, and most of the pullers in solb train the group sitting at bottleneck. Blame the group for sitting there if you want but imo if you're pulling through a group be prepared to lose a mob when it agros the group over your puller and be ready to get bitched at when you train the group out.
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